I sure hope Isabelle isn't meant to be a FL. What's the point in all that blushing now, when she had clearly been among all those students that averted their eyes when Frey had been bullied.
So I make my bet that that Isabelle lass is gonna fall for MC because of his greatness, power and wits despite totally ignoring his(Frey) sufferings before this. That is the way whores are. I hope I'm mistaken because if MC fall for her too I will hate even MC.